Study on the application of cobalt-based photo-Fenton distillation membrane to the treatment of actual landfill leachate
Landfill leachate contains all kinds of harmful substances,which pose a threat to human health and ecological environment.Although membrane distillation(MD)has the advantages of high interception efficiency and low operating pressure,it shows certain potential in the treatment of landfill leachate.However,in the practical application of MD,the membrane complexation fouling caused by organic and inorganic substances reduces the efficiency of water purification,thus limiting its potential application.To solve this problem,this study integrated sulfate radical based advanced oxidation process(SR-AOPs)into MD technology to enhance the control of membrane fouling.Co3O4/NCDs/PVDF(CN-PVDF)photo-Fenton distillation membrane was synthesized by direct hydrothermal method combined with vacuum filtration,and it was first used in direct contact membrane distillation(DCMD)to treat landfill leachate.Under visible light irradiation of 1.9 kW/m2 and activation of 20 mmol/L peroxymonosate(PMS),which could alleviate membrane fouling during DCMD treatment of actual landfill leachate wastewater,and reduce the deposition of Ca2+,Mg2+,and organic matter on the membrane surface during water production.In addition,CN-PVDF membrane can realize the self-cleaning effect of photo-Fenton,and the specific flux of CN-PVDF membrane can recover significantly from 0.449 to 0.928 after cleaning.In conclusion,this study proposes an innovative method to improve the anti-pollution ability of MD mem-branes.
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